Showing papers by "Daniel Tondeur published in 1984"
TL;DR: In this article, it is shown that an important source of entropy is related to the propagation in the column of sharp concentration fronts of large amplitude (shocks), and some unconventional chromatographic modes are presented (two-way chromatography, segmented recycle chromatography) which reduce this particular source, and thus reduce the eluent consumption required to reach a given product purity.
Abstract: Irreversibilities in industrial chromatographic processes imply dissipation of free enthalpy in the form of dilution of the products by the eluent. It is shown that an important source of entropy is related to the propagation in the column of sharp concentration fronts of large amplitude (shocks). Some unconventional chromatographic modes are presented (two-way chromatography, segmented recycle chromatography) which reduce this particular source of entropy, and thus reduce the eluent consumption required to reach a given product purity. The performances of these modes are compared with those of the two conventional operating modes (classical single-pass chromatography, and chromatography with intermediate cut and recycle). The analysis is illustrated by experiments on the separation of K + and Na + cations with H + as eluent on a sulfonic ionic exchanger bed.
13 citations
TL;DR: In this paper, specific parametric pumping experiments are presented, performed on a cation exchange resin with only one cation in the system; that is, without ion exchange, and the results show that the electrolyte can be concentrated and diluted; the direction of the concentration-dilution effect greatly depends on the cation considered.
2 citations